Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressure of 1 molal solution of a non-volatile solute in it.

Calculate the mass of a non-volatile solute (molar mass 40 g mol⁻¹) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.

A solution containing 30 g of non-volatile solute exactly in 90 g of water has a vapour pressure of 2.8 kPa at 298 K. Further, 18 g of water is then added to the solution and the new vapour pressure becomes 2.9 kPa at 298 K. Calculate:

1. molar mass of the solute.
2. vapour pressure of water at 298 K.

100 g of liquid A (molar mass 140 g mol⁻¹) was dissolved in 1000 g of liquid B (molar mass 180 g mol⁻¹). The vapour pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 Torr.

Benzene and toluene form ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in vapour phase if 80 g of benzene is mixed with 100 g of toluene.

What do you mean by activity and selectivity of catalysts?

Why is zinc not extracted from zinc oxide through reduction using CO?

The value of Δ_tG^θ for formation of Cr₂O₃ is −540 kJ mol⁻¹ and that of Al₂O₃ is −827 kJ mol⁻¹. Is the reduction of Cr₂O₃ possible with Al?

Predict conditions under which Al might be expected to reduce MgO.

Indicate the types of isomerism exhibited by the following complex and draw the structures for these isomers:

K[Cr(H₂O)₂(C₂O₄)₂]

Indicate the types of isomerism exhibited by the following complex and draw the structures for these isomers:

[Co(en)₃]Cl₃

Indicate the types of isomerism exhibited by the following complex and draw the structures for these isomers:

[Co(NH₃)₅(NO₂)](NO₃)₂

Indicate the types of isomerism exhibited by the following complex and draw the structure for this isomer:

[Pt(NH₃)(H₂O)Cl₂]

How many geometrical isomers are possible in the following coordination entity? 

[Cr(C₂O₄)₃]³⁻

How many geometrical isomers are possible in the following coordination entity? 

[Co(NH₃)₃Cl₃]

Draw the structure of optical isomers of [Cr(C₂O₄)₃]³⁻.

Draw the structure of optical isomers of [PtCl₂(en)₂]²⁺.

Draw the structure of optical isomers of [Cr(NH₃)₂Cl₂(en)]⁺.

Draw all the isomers (geometrical and optical) of [CoCl₂(en)₂]⁺.

Draw all the isomers (geometrical and optical) of [Co(NH₃)Cl(en)₂]²⁺.